Check the grounds and the connections first. Bad/corroded ground will keep you from starting. Bad/corroded positive connections will do the same thing. After that, verify that your charger is working properly. That the batteries out (or bring a charger that is know to work) to the coach, disconnect the batteries and see if you can charge them back up one at a time. You may have a bad cell in a battery, a bad connection, or a bad charger.
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